251263 has 2 divisors, whose sum is σ = 251264. Its totient is φ = 251262.

The previous prime is 251261. The next prime is 251287. The reversal of 251263 is 362152.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251263 - 2¹ = 251261 is a prime.

Together with 251261, it forms a pair of twin primes.

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 251263.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125631 + 125632.

It is an arithmetic number, because the mean of its divisors is an integer number (125632).

2²⁵¹²⁶³ is an apocalyptic number.

251263 is a deficient number, since it is larger than the sum of its proper divisors (1).

251263 is an equidigital number, since it uses as much as digits as its factorization.

251263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 360, while the sum is 19.

The square root of 251263 is about 501.2614088477. The cubic root of 251263 is about 63.1019596991.

Subtracting 251263 from its reverse (362152), we obtain a square (110889 = 333²).

The spelling of 251263 in words is "two hundred fifty-one thousand, two hundred sixty-three".